I found a small round blue pill with no imprint or number on it a friend said it could be xanax?

The FDA requires for pills/caplets/capsules, etc. to have an imprint, prescription and non prescription.

Besides without the imprint it is impossible to identify pills/caplets/capsules online.

Your pill could be a vitamin, a diet/herbal/energy pill, llicit or a foreign pill.

Perhaps if you show it to your pharmacist/chemist, he/she may be able to id it.

Take care,